Hypothetically ,.. yes.
Someone who has Ebola sheds viruses when showing outward physical symptoms
If the victim touches a hard surface, these virus sheds are called 'fomites'
Fomites can remain alive for up to 5 days, depending on temperature and humidity.
So yes,technically it is possible , but unlikely .
Or , just don't pick up your mail for 5 days , in which case you need a larger mailbox due to the build up of outstanding bills.
Not just hard surfaces, but porous ones including fabrics are readily contaminated, apparently retain the viral load longer, and are harder to decontaminate.